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One possibility for substantial weight saving has not been mentioned:
vacuum bagging.

Comparing two identical parts showed that the normal layup weighed 18%
more than the part done with vacuum.  The vacuum part is also thinner
even though the number of BIDs is the same.  Additionally, the vacuum
layups are noticeably stiffer (stronger).

Imagine how much weight 18% of all the layups would be.

When properly done, there are no bubbles with vacuum.

The downside of vacuum is the extra material.  Having just started up
the learning curve, I can't say whether it takes less time, but I
suspect that in the long run there won't be much difference.  It
probably can't be used everywhere, but for those heavy support brackets
for flap tracks etc., there should be no problem.

For the vacuum, I replaced the intake filter on the shop compressor with
a glass adapter to which the vacuum filter and hoses are connected.  Can
get up to 900mb vacuum; normally 200 mb is enough.

FWIW.

John Herminghaus
LIV-P        I-VVVV



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Please send your photos and drawings to marvkaye@olsusa.com.
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